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XC. Notices respecting New Books. 
Recent Publications. 
Tus Philosophical Transactions of the Royal Society of Lon- 
don for 1821, Part II. are just published, and the following are 
their contents: 
XIV. An Account of Experiments to determine the Times of 
Vibration of the Pendulum in different Latitudes. By Captain 
Edward Sabine, of the Roval Reg. of Artillery, F.R.S. and F.L.S. 
—XV. Some Observations and Experiments on the Papyri found 
in the Ruins of Herculaneum. By Sir Humphry Davy, Bart. 
P.R.S.—XVI. Observations on Naphthaline, a peculiar Sub- 
stance resembling a concrete essential Oil, which is apparently 
produced during the Decomposition of Coal Tar by Exposure 
toared Heat. By J. Kidd, M.D. Professor of Chemistry, Ox- 
ford. Communicated by W. H. Wollaston, M.D. V.P. R.S.— 
XVII. On the Aberrations of compound Lenses and Object- 
Glasses. By J. F.W. Herschel, Esq. F.R.S. —XVIII. An Ac- 
count of the Skeletons of the Dugong, two-horned Rhinoceros, 
and Tapir of Sumatra, sent to England by Sir Thomas Stam- 
ford Raffles, Governor of Bencoolen. By Sir Everard Home, 
Bart. V.P.R.S.—XIX. On the mean Density of the Earth. By 
Dr. Charles Hutton, F.R.S.—XX. On the Separation of Iron 
from other Metals. By J. F. W. Herschel, Esq. F.R S. — 
XXI. On the Re-establishment of a Canal in the Place of a Por- 
tion of the Urethra which had been destroyed... By Henry Earle, 
Esq. Surgeon to the Foundling, and Assistant Surgeon to St. 
Bartholomew’s Hospital. Communicated by the President.— 
XXII. Calculations of some Observations of the Solar Eclipse on 
the 7th of September 1820. By Mr. Charles Rumker. Com- 
municated by Thomas Young, M.D. For. Sec. R.S.—XXIII. An 
Account of the Re-measurement of the Cube, Cylinder, and 
Sphere, used by the late Sir George Shuckburgh Evelyn, in his 
Inquiries respecting a Standard of Weights and Measures. By 
Captain Henry Kater, F.R.S.—XXIV. An Account of Observa- 
tions made with the Eight-feet Astronomical Circle, at the Ob- 
servatory of Trinity College, Dublin, since the Beginning of the 
Year 1818, for investigating the Effects of Parallax and Aberra- 
tion on the Places of certain fixed Stars; also the Comparison 
of these with former Observations for determining the Effects of 
Lunar Nutation. By the Rev. John Brinkley, D.D. F.R.S. and 
M.R.I.A. Andrews Professor of Astronomy in the University of 
Dublin.—XXV. On the Effects produced in the Rates of Chro- 
nometers by the Proximity of Masses of Iron. By Peter Te 
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